.page-enter-active,.page-leave-active{
  transition: opacity 1s;
}
.page-enter, .page-leave-active{
  opacity: 0;
}

/* 针对单独页面的路由动画效果 */
.about-enter-active,.about-leave-active{
  transition:all 2s;
  font-size: 12px;
}
.about-enter, .about-leave-active{
  opacity: 0;
  font-size: 50px;
}
